Stop pawl for horological movement

Abstract

A stop pawl for a horological movement, including a body provided on the periphery with a lug for latching with the toothing of a ratchet; a hub intended to cooperate freely in rotation with a fixed rod according to an angular displacement between an active position meshing the lug with the toothing of the ratchet and an inactive position, via intermediate positions; wherein the pawl includes at least one device for returning the pawl during its angular displacement, from the inactive position to the active position; and wherein the return device and the body are made in one piece. A horological movement and timepiece can include such a pawl.

The invention claimed is: 
     
       1. A stop pawl for a horological movement, comprising:
 a body provided with at least, on the periphery, a lug for latching with the toothing of a ratchet; and 
 a hub intended to cooperate freely in rotation with a fixed rod according to an angular displacement between an active position meshing said lug with the toothing of said ratchet and an inactive position, via intermediate positions; 
 wherein said stop pawl includes at least: one means for returning said stop pawl during its angular displacement, from the inactive position to the active position, 
 wherein said return means and said body are made in one piece, 
 wherein the return means includes at least one elastic blade with one end integral with said body and a free opposite end, 
 wherein the body includes, protruding at the periphery of said body and located facing the opposite end, a hooking means in abutment with said opposite end, and 
 wherein the lug is positioned on a periphery of the body and spaced apart from the elastic blade and the free opposite end. 
 
     
     
       2. The stop pawl according to  claim 1 , wherein said body comprises:
 a groove extending between an inner face of said elastic blade and said body from the end integral with said body and to the free end of said elastic blade. 
 
     
     
       3. The stop pawl according to  claim 2 , wherein:
 the free end of said elastic blade comprises an overhang protruding on the inner face, and 
 said groove comprises, facing the overhang, a notch for receiving said overhang. 
 
     
     
       4. The stop pawl according to  claim 1 , wherein:
 said hub is closed and is in the shape of a circular bore. 
 
     
     
       5. The stop pawl according to  claim 1 , wherein:
 said hub is open, said body having an overall U-shape. 
 
     
     
       6. The stop pawl according to  claim 1 , wherein:
 said body is made of a metallic material. 
 
     
     
       7. The stop pawl according to  claim 1 , wherein:
 said body is made of a nickel-phosphorus alloy. 
 
     
     
       8. The stop pawl according to  claim 1 , wherein:
 said body is manufactured by a LIGA-type method. 
 
     
     
       9. A horological movement, comprising:
 a supporting structure in a shape of a blank; 
 a ratchet mounted on said supporting structure in a rotary movement, said ratchet being provided with toothing; 
 a mechanism for latching with the toothing of said ratchet, said latching mechanism being rotatably mounted inside a housing formed within said blank; 
 a rod for free rotation of said latching mechanism within the housing of said blank, said rod fixedly cooperating with a bore formed within the housing of said blank; 
 wherein: 
 said latching mechanism comprises a stop pawl according to  claim 1 . 
 
     
     
       10. The horological movement according to  claim 9 , wherein:
 in an upper portion, the rod comprises a head, ensuring the upper retention of the pawl along said rod. 
 
     
     
       11. The horological movement according to  claim 9 , wherein:
 said bore is tapped; 
 said rod is in the shape of a screw. 
 
     
     
       12. The horological movement according to  claim 9 , wherein:
 said rod is in the shape of a nail driven into said bore. 
 
     
     
       13. The horological movement according to  claim 9 , wherein:
 said housing comprises an inner wall cooperating with an outer face of the elastic blade of said pawl. 
 
     
     
       14. A timepiece comprising a horological movement according to  claim 9 .